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<head>
  <title>Test MediaElementAudioSourceNode</title>
  <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
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<pre id="test">
<script class="testbody" type="text/javascript">
SimpleTest.waitForExplicitFinish();

function test() {
  var audio = new Audio("small-shot.ogg");
  var context = new AudioContext();
  var expectedMinNonzeroSampleCount;
  var expectedMaxNonzeroSampleCount;
  var nonzeroSampleCount = 0;
  var complete = false;
  var iterationCount = 0;

  // This test ensures we receive at least expectedSampleCount nonzero samples
  function processSamples(e) {
    if (complete) {
      return;
    }

    if (iterationCount == 0) {
      // Don't start playing the audio until the AudioContext stuff is connected
      // and running.
      audio.play();
    }
    ++iterationCount;

    var buf = e.inputBuffer.getChannelData(0);
    var nonzeroSamplesThisBuffer = 0;
    for (var i = 0; i < buf.length; ++i) {
      if (buf[i] != 0) {
        ++nonzeroSamplesThisBuffer;
      }
    }
    nonzeroSampleCount += nonzeroSamplesThisBuffer;
    is(e.inputBuffer.numberOfChannels, 1,
       "Checking data channel count (nonzeroSamplesThisBuffer=" +
       nonzeroSamplesThisBuffer + ")");
    ok(nonzeroSampleCount <= expectedMaxNonzeroSampleCount,
       "Too many nonzero samples (got " + nonzeroSampleCount + ", expected max " + expectedMaxNonzeroSampleCount + ")");
    if (nonzeroSampleCount >= expectedMinNonzeroSampleCount &&
        nonzeroSamplesThisBuffer == 0) {
      ok(true,
       "Check received enough nonzero samples (got " + nonzeroSampleCount + ", expected min " + expectedMinNonzeroSampleCount + ")");
      SimpleTest.finish();
      complete = true;
    }
  }

  audio.onloadedmetadata = function() {
    var node = context.createMediaElementSource(audio);
    var sp = context.createScriptProcessor(2048, 1);
    node.connect(sp);
    // Use a fuzz factor of 100 to account for samples that just happen to be zero
    expectedMinNonzeroSampleCount = Math.floor(audio.duration*context.sampleRate) - 100;
    expectedMaxNonzeroSampleCount = Math.floor(audio.duration*context.sampleRate) + 500;
    sp.onaudioprocess = processSamples;
  };
}

SpecialPowers.pushPrefEnv({"set": [["media.preload.default", 2], ["media.preload.auto", 3]]}, test);

</script>
</pre>
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